a. During the formation
process.
b. As a red giant
c. As a supergiant.
d. On the main sequence.
e. During the planetary
nebula stage.

A star with half of the mass of the Sun has a luminosity only 0.1 times
that of the Sun. How does the star's main sequence life time compare with
that of the Sun?

a. it will be about 10 times
longer than the Sun's
b. it will be about 10 times
shorter than the Sun's
c. it will be about 5 times
longer than the Sun's
d. it will be about 5 times
shorter than the Sun's

Which of the following occurs during and immediately after the phase of
the hydrogen burning shell?

a. the core shrinks until
the star becomes a white dwarf
b. the helium flash occurs
c. the core temperature
decreases while the envelope temperature increases
d. the star becomes a supernova
e. the envelope expands
and cools, and the star becomes a red giant

After a Sun-like star enters its second red giant phase, its internal structure
would consist of

a. a carbon core surrounded
by a helium burning shell, which is surrounded by a hydrogen burning shell.
b. a helium core surrounded
by a hydrogen burning shell.
c. a iron core surrounded
by many different layers of shell burning.
d. a oxygen core surrounded
by a carbon burning shell, a helium burning shell, and a hydrogen burning
shell.

Why doesn't a helium flash occur in a large mass star?

a. the core is not hot enough
b. the core is degenerate
c. the core is not degenerate
d. it does occur, the question
is incorrect

A neutron star's size is that of

a. the Sun.
b. the Earth.
c. the Earth's orbit.
d. the State of Iowa.
e. a typical city.